TLE 6244X
1.11 Notes for the Application in Commercial Vehicles
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For electric systems with 24V battery voltage, that can even increase to
load dump, some peculiarities have to be observed!
37V in case of
The static voltage at pin UBatt without destruction is limited to 37V, therefore this pin must either
be connected to the 5V supply voltage VDD or else the voltage at pin UBatt has to be limited by
adequate external circuitry. By connecting pin UBatt to VDD the values of Rds, on of the power
switches will increase up to 20%.
The power stages 7...18 are equipped with a 40V active clamping. Therefore this power stages
must only drive loads with an accordingly high resistance that can be switched on in case of over-
voltage (e.g. a maximum load dump voltage of 60V and a load resistor of 1kΩ result in a power
dissipation of 0.8W for each power stage. For all of the 12 power stages together there is a power
dissipation of 9.6W for the typical duration of a load dump of 500ms.).
The restrictions listed above are no longer relevant in case of a „overvoltage-protected
battery voltage“within the 24V electric system that limits the voltage to e.g. a maximum of
37V.
The thresholds of the currents, on which the power stages are switched off in case of overload,
are increased by approximately 25% if there is a voltage at pin UBatt higher than19V (reason:
jump start requirements in 12V electric systems). Exception: OUT9 and OUT10 and OUT15...
OUT18. See characteristics in chapters 3.5.3, 3.6.3, 3.7.3 and 3.8.3.
The restrictions concerning overload of power stages (see 3.5.2, 3.6.2, 3.7.2 and 3.8.2) and per-
missible clamping energy (see 3.5.8, 3.6.8, 3.7.8 and 3.8.8) are relevant further on.
1.11.1 Notes for short circuit limitation
The power stages are short circuit protected for the following conditions:
The max. voltage at the output pins are limited to 36V and the TLE6244 is not operating in the
booster mode.
The power stages will be switched on/off with a max. frequency of 1 kHz.
Only a 40 msec burst with the 1 kHz on/off-frequency is allowed, with a minimum burst repetition
time of 1 sec. The maximum number of burst repetition cycles is 25. The number of driving cycles
under these conditions is limited to 100 in lifetime. The temperature of the slug of the MQFP64
package must not exceed 130°C.
These limitations are valid for UBatt > 24 V.
For Ubatt ≤ 24 V the number of driving cycles under these conditions is extended to 1000 in life-
time.
Final Data Sheet
37
V4.2, 2003-08-29
INFINEON [ Infineon ]
